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Comparison of Protection Mechanisms: Capacity Efficiency and Recovery Time

Comparison of Protection Mechanisms: Capacity Efficiency and...

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IEEE International Conference on Communications (ICC)

作者： W. He A. K. Somani Dependable Computing & Networking Laboratory Department of Electrical & Computer Engineering Iowa State University Ames IA USA

High efficiency in capacity utilization and fast restoration are two primary goals of survivable design in optical networks. Shared backup path protection has been shown to be efficient in terms of capacity utilization, due to the sharing of backup capacity. However, sharing of backup capacity also complicates the restoration process, and leads to slow recovery. Ring-type protection in mesh topology, on the other hand, has the advantage of fast restoration. The p-cycle scheme is the most efficient ring-type protection method in terms of capacity utilization. Recently, the concept of pre-cross-connected protection was proposed to increase the recovery speed of shared path protection. We overview these protection methods and their failure recovery processes. The recovery time of these schemes are compared analytically. To compare the capacity efficiency, we formulate integer programming optimization problems for three protection methods in static traffic scenario, considering wavelength continuity constraint. We investigate the effect of network connectivity on the performance of capacity utilization of the methods by experimenting on topologies with different average nodal degrees.

关键词： Protection WDM networks computer networks Optical computing Optical design Optical fiber networks Network topology Communications Society Helium Laboratories

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On Modeling VoIP Traffic in Broadband Networks

On Modeling VoIP Traffic in Broadband Networks

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IEEE GLOBECOM 2007 - IEEE Global Telecommunications Conference

作者： Ehsan Haghani Swades De Nirwan Ansari Advanced Networking Laboratory Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

With the general trend towards ubiquitous access to networks, more users will prefer to make voice calls through the Internet. Voice over IP (VoIP) as the application which facilitates voice calls through the Internet will increasingly occupy more traffic. The growth of delay sensitive traffic that requires special quality of service from the network will impose new constraints on network designers who should wisely allocate the limited resources to users based on their required quality of service. An efficient resource allocation depends upon gaining accurate information about the traffic profile of user applications. In this paper, we have studied the access level traffic profile of VoIP applications and proposed a realistic distribution model for VoIP traffic. Based on our model, we have introduced an algorithm for resource allocation in networks. It is shown that using our algorithm will enhance the delay and utilization performance of the network.

关键词： Telecommunication traffic Traffic control Broadband communication Resource management Internet telephony Quality of service Web and internet services IP networks Application software Monitoring

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Plasma waves in two-dimensional electron systems and their applications

Plasma waves in two-dimensional electron systems and their a...

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作者： Ryzhii, Victor Khmyrova, Irina Ryzhii, Maxim Satou, Akira Otsuji, Taiichi Mitin, Vladimir Shur, Michael S. Computer Solid State Physics Laboratory University of Aizu Aizu-Wakamatsu 965-8580 Japan Research Institute of Electrical Communication Tohoku University Sendai 980-8577 Japan Department of Electrical Engineering University at Buffalo SUNY Buffalo NY 14260 United States Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY 12180 United States

We overview the plasma properties of a two-dimensional electron gas in semiconductor heterostructures as well as new concepts and proposals of novel terahertz devices (detectors, sources utilizing plasma instabilities... 详细信息

关键词： Electron gas

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Elliptic Curve Cryptosystem-Based Group Key Management for Secure Group Communications

Elliptic Curve Cryptosystem-Based Group Key Management for S...

引用

MILCOM, Military Communications Conference

作者： Pitipatana Sakarindr Nirwan Ansari Advanced Networking Laboratory Electrical and Computer Engineering Department New Jersey Institute of Technology Newark NJ USA

Group key management (GKM) prevents all non-membership users from acquiring the group key to decrypt the encrypted messages broadcasted among group members. In this paper, we incorporate elliptic curve cryptosystem (ECC) into GKM to decrease the key length while providing securities at the same level as that of other cryptosystems, and propose the cluster scheme to make the key management more efficient.

关键词： Elliptic curves Elliptic curve cryptography Public key cryptography Broadcasting Security computer network management Technology management engineering management Laboratories computer networks

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A Proactive Test Based Differentiation Technique to Mitigate Low Rate DoS Attacks

A Proactive Test Based Differentiation Technique to Mitigate...

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International Conference on computer Communications and Networks (ICCCN)

作者： Amey Shevtekar Nirwan Ansari Advanced Networking Laboratory Department of Electrical and Computer Engineering New Jersey Institute of Technology Newark NJ USA

Low rate DoS attacks are emerging threats to the TCP traffic, and the VoIP traffic in the Internet. They are hard to detect as they intelligently send attack traffic inside the network to evade current router based congestion control mechanisms. We propose a practical attack model in which botnets that can pose a serious threat to the Internet are considered. Under this model, an attacker can scatter bots across the Internet to launch the low rate DoS attack, thus essentially orchestrating the low rate DoS attack that uses random and continuous IP address spoofing, but with valid legitimate IP addresses. It is difficult to detect and mitigate such an attack. We propose a low rate DoS attack detection algorithm, which relies on the core characteristic of the low rate DoS attack in introducing high rate traffic for short periods, and then uses a proactive test based differentiation technique to filter the attack packets. The proactive test was originally proposed to defend DDoS attacks and low rate DoS attacks which tend to ignore the normal operation of network protocols, but it is tailored here to differentiate the legitimate traffic from the low rate DoS attack traffic instigated by botnets. It leverages on the conformity of legitimate flows, which obey the network protocols. It mainly differentiates legitimate connections by checking their responses to the proactive tests which include puzzles for distinguishing botnets from human users. We finally evaluate and demonstrate the performance of the proposed low rate DoS attack detection and mitigation algorithm on the real Internet traces.

关键词： Testing computer crime Internet Communication system traffic control Traffic control Telecommunication traffic Protocols Intelligent networks Scattering Detection algorithms

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Dynamic modeling of wind farms with fixed-speed wind turbine generators

Dynamic modeling of wind farms with fixed-speed wind turbine...

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2007 IEEE Power engineering Society General Meeting, PES

作者： Wei, Qiao Harley, Ronald G. Venayagamoorthy, Ganesh K. IEEE School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA 30332-0250 United States University of KwaZulu-Natal Durban South Africa Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering University of Missouri-Rolla Rolla MO 65409-0249 United States

ISBN: (纸本)1424412986

A wind farm typically consists of a large number of individual wind turbine generators (WTGs) connected by an internal electrical network. To study the impact of wind farms on the dynamics of the power system, an important issue is to develop appropriate wind farm models to represent the dynamics of many individual WTGs. This paper presents various dynamic models, including a detailed model and three reduced-order equivalent models, of wind farms with fixed-speed WTGs. These models are developed and compared by simulation studies in the PSCAD/EMTDC environment under different wind velocity and fluctuation conditions as well as gird fault conditions. Concluding remarks are provided on how to choose an appropriate wind farm model for power system dynamic and transient studies. © 2007 IEEE.

关键词： Power plants

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Resonant terahertz detection antenna utilizing plasma oscillations in lateral schottky diode

Resonant terahertz detection antenna utilizing plasma oscill...

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作者： Satou, Akira Ryzhii, Victor Otsuji, Taiichi Shur, Michael S. Computer Solid State Physics Laboratory University of Aizu Aizu-Wakamatsu 965-8580 Japan Research Institute of Electrical Communication Tohoku University Sendai 980-8577 Japan Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY 12180 United States

The terahertz (THz) resonant detectors based on 2DEG channels with lateral Schottky junctions (LSJ) by accounting for the effects of the contact pads serving as an antenna are discussed. These devices have the structures similar to high-electron-mobility transistors except that they have LSJs at either source or drain contacts. Plasma oscillations in the channels are excited by THz signals supplied by external antennas or coupled through the contact pads. The THz signals induce rectified currents due to the nonlinear current-voltage characteristics at LSJ. Detected signals can be resonantly large when the frequency of signals is close to one of the resonant plasma frequencies, which can be in the THz range for the submicrometer channel with sufficiently large electron concentration. The lateral Schottky diode antenna has the first peak with smaller resonant frequency compared with the responsivity of the lateral Schottky diode connected with an external antenna.

关键词： Antennas

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A compositional method for the synthesis of asynchronous communication mechanisms

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28th International Conference on Applications and Theory of Petri Nets and Other Models of Concurrency

作者： Gorgonio, Kyller Cortadella, Jordi Xia, Fei Embedded Systems and Pervasive Computing Laboratory Federal University of Campina Grande Brazil Department of Software Universitat Politécnica de Catalunya Spain School of Electrical Electronic and Computer Engineering University of Newcastle Upon Tyne United Kingdom

ISBN: (纸本)9783540730934

Asynchronous data communication mechanisms (ACMs) have been extensively studied as data connectors between independently timed concurrent processes. In previous work, an automatic ACM synthesis method based on the generation of the reachability graph and the theory of regions was proposed. In this paper, we propose a new synthesis method based on the composition of Petri net modules, avoiding the exploration of the reachability graph. The behavior of ACMs is formally defined and correctness properties are specified in CTL. Model checking is used to verify the correctness of the Petri net models. The algorithms to generate the Petri net models are presented. Finally, a method to automatically generate C++ source code from the Petri net model is described.

关键词： asynchronous communication mechanisms Petri nets concurrent systems synthesis model checking protocols

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Analysis of Indoor PLC Networks: laboratory Tests and Simulation Results

Analysis of Indoor PLC Networks: Laboratory Tests and Simula...

引用

Power Tech Conference

作者： T. A. Papadopoulos G. Ch. Argyropoulos B. D. Sarantinos G. K. Papagiannis Power Systems Laboratory Department of Electrical & Computer Engineering Aristotle University of Thessaloniki Greece

PLC technology applications in low voltage indoor power grids apart from Internet services are related also to monitoring and remote control applications. The CENELEC B band provides adequate transfer rate for such narrow band PLC applications. This paper presents an indoor network model, suitable for the analysis of narrow band PLC transmission. laboratory tests and simulation results concerning signal transmission characteristics for the different model configurations are reported. The ATP-EMTP program is used for the simulation of the transmission path. Results obtained by the simulation of different cases with variable electrical appliances connected are compared to the actual measurements from laboratory tests, showing satisfactory agreement. The impact of the appliances on the signal transmission is investigated and they are classified accordingly. Finally, the proposed equivalent models are used in a simulation of the signal transmission in a building.

关键词： Programmable control Laboratories Testing Analytical models Narrowband Low voltage Power grids Web and internet services Remote monitoring Voltage control

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Medium Voltage Network PLC Modeling and Signal Propagation Analysis

Medium Voltage Network PLC Modeling and Signal Propagation A...

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2007 IEEE International Symposium on Power Line Communications and its Applications (ISPLC 2007)

作者： T. A. Papadopoulos B. D. Batalas A. Radis G. K. Papagiannis Power Systems Laboratory Department of Electrical & Computer Engineering Aristotle University of Thessaloniki Greece

PLC technology applications in Medium Voltage (MV) distribution networks are mainly related to the monitoring, control and metering applications. The CENELEC A band provides adequate transfer rate for such narrow band PLC applications. Scope of this paper is to present simulation results concerning NPL signalling on MV distribution networks. Cases of underground cables, overhead lines and distribution transformers are examined. All simulations have been done using the Electromagnetic Transients Program (ATP-EMTP). Results seem to be consistent with transmission line theory and modal wave propagation, showing standing wave signal voltage profiles along the lines. The case of an existing aerial MV distribution network is also examined for different frequencies and loading conditions, including open-ended lines, transformers, compensation capacitors and combinations of them.

关键词： Powerline Communication Power Distribution System Traveling wave analysis Electromagnetic Transients (EMTP)

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